下列关于细胞癌变的说法正确的是 [ ]

A．当正常的成纤维细胞由球形转变成扁平梭形时，说明细胞已经发生癌变

B．致癌病毒含有病毒癌基因及与致癌有关的核酸序列，所以能引起人体细胞发生癌变

C．原癌基因主要负责控制细胞分裂，抑癌基因主要负责控制细胞生长

D．强烈的紫外线可能会使原癌基因或抑癌基因发生突变，导致正常细胞的生长和分裂失控而变成癌细胞

—Can you get me some of the novels ?

—By all means. All but one of them ____ in our company.

A．published

B．was published

C．were published

D．had been published